Lecture—22 September 2003

Body space-coelom

False or pseudocoeloms

True or eucoeloms

Schizocoely—original opening becomes the mouth==Protostomates—typically associated with spiral cleavage

Enterocoely—original opening becomes the anus==Deuterostomates—most often associated with radial cleavage

How did the body cavity come about?

Coelom functions

Buffer

Place for storage

Aiding and abetting diffusion and movement of wastes and oxygen

Related to reproduction—gonocoel theory

Related to excretion—nephrocoel theory